{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{2}{c}}
\hline\hline
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}\\
                    &\multicolumn{1}{c}{ & \multicolumn{1}{c}{Pollution in fields} & \multicolumn{1}{c}{Pollution in mills} \\ &PM\_{2.5} &PM\_{2.5}  \\}&\multicolumn{1}{c}{pm25\_treat\_did\_millp}\\
\hline
After 2015 $\times$ Regulated&       1.185** &      -0.397*  \\
                    &     (0.580)   &     (0.205)   \\
\hline
Pre 2015 Mean       &      17.765   &      13.820   \\
Obs.                &      20,127   &         324   \\
R-squared           &       0.508   &       0.929   \\
Year FE             &          No   &         Yes   \\
Month by Year FE    &         Yes   &          No   \\
Mill FE             &         Yes   &         Yes   \\
Weather controls    &         Yes   &         Yes   \\
Cluster level       &        Mill   &        Mill   \\
\hline\hline
\end{tabular}
}
